package homework10;



import java.util.Scanner;

public class Seven01 {
	public static void main(String args[]){
		Scanner sc=new Scanner(System.in);
		int arr[]=new int[5];
		String str=null;
		while(true){
			String choice = sc.next();
			try{
				if(choice.equals("arr")){
					int index = sc.nextInt();
					arr[index]=1;
				}
				else if(choice.equals("null")){
					str.length();
				}
				else if(choice.equals("cast")){
					Object o = new String("str");
					Integer x= (Integer)o;
				}else if(choice.equals("num")){
					String intNum = sc.next();
					Integer.parseInt(intNum);
				}else 
					break;
			}catch(Exception e){
				System.out.println(e);
			}
			
			
		}	
		sc.close();
}

}
